C999 - Unknown error
I am using the current version. C999 I encountered an unknown error. When I try to attach a PDF, it says "Could not add attachment. International message: Access denied."
I proceeded over the "% localappdata% \ Swiss Academic Software \ Citavi 6 \" suggested in the previous questions. but now it doesn't open with the error "An error occurred" when accessing pre-existing files.
How should I proceed?